Sulfonic-functionalized heteropolyacid-SiO2 nanoparticles were synthesized by grafting and oxidizing of a thiol-silane compound onto the heteropolyacid-SiO2 nanoparticle surface. The surface functionalization was confirmed by solid-state NMR spectroscopy. The composite membrane containing the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was prepared by blending with Nafion® ionomer. TG-DTA analysis showed that the composite membrane was thermally stable up to 290 °C. The DMFC performance of the composite membrane increased the operating temperature from 80 to 200 °C. The function of the sulfonic-functionalized heteropolyacid-SiO2 nanoparticles was to provide a proton carrier and act as a water reservoir in the composite membrane at elevated temperature. The power density was 33 mW cm-2 at 80 °C, 39 mW cm-2 at 160 °C and 44 mW cm-2 at 200 °C, respectively.
Bibliographical noteFunding Information:
This work was supported by Ministry of Science and Technology of Korea through the National Research Laboratory Program. And, authors also appreciate the financial support from Korea Research Foundation Grant (2005-005-J01402).
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering